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Acquisitions - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 03, 2019
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Business Acquisition [Line Items]        
Total cash consideration paid for acquisitions, net of cash acquired     $ 1.7 $ (114.7)
Reclassification of foreign currency translation adjustments related to previously held equity interest   $ 32.5   32.5
Total contingent consideration payments for acquisitions       13.0
Manpower Switzerland        
Business Acquisition [Line Items]        
Total cash consideration paid for acquisitions, net of cash acquired $ 317.5      
Percentage interest acquired 51.00%      
Cash consideration for acquisitions       212.7
Acquired interests $ 58.3      
Cash and cash equivalents 154.4      
Total cash impact of the acquisition 104.8      
Reclassification of foreign currency translation adjustments related to previously held equity interest 32.5      
Manpower Switzerland | Interest and Other Expenses (Income), Net        
Business Acquisition [Line Items]        
Non-cash gain on disposition of previously held equity interest $ 80.4 $ 80.4   80.4
Experis AG        
Business Acquisition [Line Items]        
Percentage interest acquired 20.00%      
Excluding Manpower Switzerland and Experis AG        
Business Acquisition [Line Items]        
Total cash consideration paid for acquisitions, net of cash acquired       $ 17.7